The firewall is a security tool. We should be first asking what's important...What's critical to have. It's annoying that everytime I'm on a TAC call I usually get the "you really shouldn't log on session start" comment.
The problem with not logging on session start is you're only notified when the session has ended (obvious.) The problem with saying "only use it for troubleshooting" is how do you troubleshoot something in the past?
Say for instance an FTP session, that session could be open for minutes, hours, or even days. You'd never be notified about that traffic until the session was closed.
Every one of my rules logs session start. Over 20k user network and we generate about 3 million logs a day. Our Panorama has 2TB of storage and we just shy of 2 months of on box retention.
... View more